Support (Election) Event creation

[edulix]

## Create Event API
  - [ ] Parse Input Data
  - [ ] Generate Election Intermediary certificate and Pub/private keys
  - [ ] Save keys in [Hashicorp Vault](https://www.vaultproject.io/)
  - [ ] Integrate [Hashicorp Vault](https://www.vaultproject.io/) deployment in Dev Containers `docker-compose.yml` 
  - [ ] Integrate Bulletin Board deployment in Dev Containers `docker-compose.yml` 
  - [ ] Create Bulletin Board associated to the Event in the BBS (Bulletin Board Service)